$2\cos\left(a\right)-2\cos^2\left(a\right)=\sin\left(a\right)\sin2\left(a\right)$
$\frac{\cos\left(x\right)}{\csc\left(x\right)}-\frac{4}{\csc\left(x\right)\tan\left(x\right)}$
$\frac{dy}{dx}+\frac{y}{2}=2+x$
$\left(5x^4-3x\right)^2$
$secx\left(cosx\:-cotx\right)$
$4^2-1$
$\int\left(6+3x\right)\cos\left(1+4x\right)dx$
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